Learn English – Interrogative Negative sentences

The key here is Heavy Noun Phrase Shift. Here's how it works:

1. First, let's start with the canonical (declarative, affirmative) version:

   [The person who acts upon this advertisement and accepts the offer]_subject puts himself to some inconvenience at the request of the defendants.

2. Then we'll add the dummy auxiliary do. We need this auxiliary for two reasons: to negate the predicate, and to mark the clause as interrogative through inversion:

   [The person who acts upon this advertisement and accepts the offer]_subject does_auxiliary put himself to some inconvenience at the request of the defendants.

3. At this point, we can negate the predicate:

   [The person who acts upon this advertisement and accepts the offer]_subject does_auxiliary not_negator put himself to some inconvenience at the request of the defendants.

4. And now we can invert the subject and auxiliary, turning our declarative clause into an interrogative clause:

   Does_auxiliary [the person who acts upon this advertisement and accepts the offer]_subject not_negator put himself to some inconvenience at the request of the defendants?

5. Last, because our subject is so long and syntactical complex, and because this is particularly formal English, we can optionally make use of the rare Heavy Noun Phrase Shift, pushing our subject to the right out of its basic position, past the negator:

   Does_auxiliary not_negator [the person who acts upon this advertisement and accepts the offer]_subject put himself to some inconvenience at the request of the defendants?

When these conditions aren't met, we can't shift the subject noun phrase to the right:

Does_auxiliary she_subject not_negator like ice cream?

*Does_auxiliary not_negator she_subject like ice cream?　(ungrammatical)

The subject she isn't long or syntactically complex enough to count as as a "heavy" noun phrase, so it can't be shifted past the negator.

In contrast, the contracted form doesn't doesn't involve Heavy NP Shift; -n't is a suffix, and so doesn't is a single word which inverts with a subject without any of these restrictions:

She_subject doesn't_{negated-auxiliary} like ice cream.

Doesn't_{negated-auxiliary} she_subject like ice cream?

For more discussion, see my previous answer.

"I have never ..." and "I haven't ever ..." mean the same thing.

"I haven't ..." is not quite the same. Depending on the context, it COULD mean "never", or it could mean that you have not done this in this particular case.

For example, suppose you're boss assigned you to write three versions of a letter to be sent to clients: one in English, one in Spanish, and one in German. Some time later he asks if you've completed the job, and you say, "I haven't written a letter in English." In this context you don't mean that you've NEVER written a letter in English, just that you haven't written a letter in English on this particular subject.